[Updated 3:30 p.m. Monday, February 25] This photo is from the main market in Yaounde, the capital of Cameroon.
[Updated 2:30 p.m. Monday, February 11] This extravagant entrance leads to a crematorium built for Norodom Sihanouk, the Cambodian king who died in October at the age of 90.
[Updated 5:30 p.m. Monday, January 28] This photo was taken in Cairo's Tahrir Square on Sunday as protesters clashed with riot police.
[Updated 4 p.m. Monday, January 21] The Northern Lights, aka "nature's most magnificent light show," can be seen in this photo taken last week at an abandoned farm in Akranes, Iceland.
[Updated 4:30 p.m. Monday, January 14] Supporters of religious leader Tahir ul Qadri head toward the Pakistani capital of Islamabad on Monday to protest the country's political system.
[Updated 3:30 p.m. Monday, January 7] The Pont des Arts in Paris is a pedestrian bridge that links the Louvre to the Institut de France, which is seen here in the distance.
[Updated 3:30 p.m. Monday, November 26] This photo hasn't been altered. It wasn't taken with a weird camera lens.
[Updated 4 p.m. Monday, November 5] People make their way through the the Gangnam district of Seoul, South Korea.
[Updated 3:45 p.m. Monday, October 29] An aluminum sculpture called "Greetingman" bows to people Wednesday in Montevideo, Uruguay.
[Updated 3:30 p.m. Monday, October 15] Two horsemen fight over a goatskin last week at the Golden Eagle Festival in western Mongolia.
[Updated 3 p.m. Monday, October 8] Tourists admire the Red Beach scenic area in Panjin, China, last week.
[Updated 2:30 p.m. Monday, October 1] Golf fans dressed as crusaders walk along the seventh hole at Medinah Country Club in Medinah, Illinois.
[Updated 3 p.m. Monday, September 24] A tourist clowns around on the colored steps at the Albertina museum in Vienna, Austria.
[Updated 3:30 p.m. Monday, September 17] A Japanese flotilla arrives at a group of disputed islands in the East China Sea.
[Updated 2:30 p.m. Monday, September 10] The above photo was taken at a platinum mine in South Africa, where 44 people were killed in clashes last month between striking miners and police.
[Updated 3 p.m. Monday, August 20] Tourists in a balloon fly over Prague Castle, one of the world's largest medieval castle complexes at nearly 70,000 square meters (753,000 square feet).
[Updated 3 p.m. Monday, July 16] That's powdered tobacco being snorted by participants in this month's World Snuff Championship.
[Updated 3:30 p.m. Monday, July 2] These man-made "supertrees" are part of Gardens by the Bay, a 250-acre landscaping project in Singapore.
[Updated 4 p.m. Monday, June 11] If you visit the Spanish capital of Madrid, you can see the Puerta de Europa ("Gate of Europe") towers in Plaza de Castilla.
[Updated 3 p.m. Monday, June 4] This massive red sandstone boulder weighs 77,000 pounds and sits in Tiergarten Park in Berlin, Germany.
[Updated 4 p.m. Monday, May 28] Thousands of Malians gather for a protest last week in front of the presidential compound in Bamako.
[Updated 3:30 p.m. Monday, May 21] A magnitude-6.0 earthquake hit northern Italy on Sunday, killing at least seven people and displacing thousands.
[Updated 3:30 p.m. Monday, May 14] This photo is from a rehearsal ceremony for last week's lighting of the Olympic flame.
[Updated 2:30 p.m. Monday, May 7] This photo was taken in the Peruvian capital of Lima, where it's common to see archaeological ruins amid the urban landscape.
[Updated 2:30 p.m. Monday, April 30] This is a view of Abbottabad, the town in northwest Pakistan where Osama bin Laden was killed one year ago this week.
[Update 3 p.m. ET Monday, April 23] Despite some out-there guesses (reader Riz Khan: "This is planet Mars"), Harmon Miller was the first to answer correctly. Congrats!
[Updated 2 p.m. Monday, April 9] Children play soccer next to a run-down building in Muelheim, a city in the industrial Ruhr region of western Germany.
[Updated 4 p.m. Monday, April 2] Hoping to catch a glimpse of the Loch Ness Monster? Your best bet -- albeit a very, very unlikely one -- might be a visit to Scotland's Urquhart Castle, pictured here.
[Updated 2:30 p.m. Monday, March 26] Children play baseball in the streets of Havana, Cuba, on Saturday.
[Updated 3 p.m. Monday, March 19] That massive stiletto shoe and the handbag to its left are both unusual vehicles made by Indian car designer Sudhakar Yadav.
[Updated 3 p.m. Monday, March 12] This photo was taken on South Georgia Island, "an untouched natural paradise of penguins, seals and birds," according to iReporter Jonathan Pozniak.
[Updated 2:30 p.m. Monday, March 5] This intricately decorated subway station is in Pyongyang, North Korea. The photo was taken four years ago, around the time when the New York Philharmonic Orchestra became the first U.S. orchestra to play in the country.
[Updated 3 p.m. Monday, February 27] Revelers perform on a monster-like float during the second night of Carnival last week in Rio de Janeiro, Brazil.
[Updated 2:45 p.m. Monday, February 20] An ostrich walks down a street in Japan's exclusion zone, 10 months after the accident at the Fukushima power plant.
[Updated 3 p.m. Monday, February 13] Tourists make their way through heavy snow last week in front of the Kiev Pechersk Lavra cathedral in Ukraine.
[Updated 4 p.m. Monday, February 6] This overcrowded train is in Jakarta, Indonesia, where it is common to see people riding on the roofs of cars in the state-run rail system.
[Updated 4 p.m. Monday, January 30] The photo above was taken in Chittagong, Bangladesh, which is a "graveyard" of sorts for old ships.
[Updated 4:45 p.m. Monday, January 23] The photo above shows a couple of Swiss soldiers shoveling snow in Davos, Switzerland.
[Updated 4:30 p.m. Monday, January 16] The photo above shows thousands of people gathering at Gani Fawehinmi Park in Lagos, Nigeria, to protest the government's elimination of the country's fuel subsidy.
[Updated 4 p.m. Monday, January 9] This is the Friedrichstrasse, one of the main shopping destinations in Berlin, Germany.
[Updated 5 p.m. Monday, December 5] A motorcade for U.S. Secretary of State Hillary Clinton arrives at the parliamentary compound in Naypyidaw, Myanmar, last week.
[Updated 4 p.m. Monday, November 28] A man passes by the Cais do Sodre train station Thursday in Lisbon, Portugal.
[Updated 2:30 p.m. Monday, November 21] An Occupy Wall Street protester raises his fist Thursday while chanting on the Brooklyn Bridge in New York City.
[Updated 2:30 p.m. Monday, November 14] Iguazu Falls looks set to be named one of the new seven wonders of nature.
Do you know where this photo was taken?
[Updated 4 p.m. Monday, October 31] A woman and three children enjoy the waterfront last week in Doha, Qatar.
[Updated 3 p.m. ET, Monday, October 24] The photo above was taken Thursday in Athens, Greece, where protesters clashed over the country's tough budget cuts.
[Updated 4:30 p.m. ET, Monday, October 17] People wade through floodwaters in Ayutthaya, Thailand, a city that has been submerged for nearly two weeks now.
[Updated 3 p.m. ET, Monday, October 10] You're looking at China's largest waterfall, the Huangguoshu waterfall in Guizhou province.
[Updated 3 p.m. ET, Monday, September 19] Riot police in Bogota, Colombia, block paintballs during street demonstrations September 7.
[Updated 3 p.m. ET, Monday, September 12] The Libyan capital of Tripoli is seen in this photo taken Thursday at sunset.
[Updated 2:30 p.m. ET, Monday, September 5] Downtown buildings in Vancouver, British Columbia, can be seen in this photo from the south side of the False Creek inlet.
[Updated 3 p.m. ET, Monday, August 29] These beachgoers are enjoying themselves on Isola dei Conigli ("Rabbit Island") in Lampedusa, Italy.
[Updated 3 p.m. ET Monday, August 15] It's a giant mosquito in Moscow!
[Updated 3 p.m. ET Monday, August 8] The photo above was taken in Tel Aviv, Israel, where thousands of people marched in the streets this weekend to protest the rising cost of living.
[Updated 3:30 p.m. ET Monday, August 1] Supporters of Ollanta Humala celebrate exit poll results at the Plaza Dos de Mayo, or May 2nd Square, in Lima, Peru, last month.
[Updated 3:28 p.m. ET Monday, July 25] The hills are alive with the sound of music ... in Salzburg, Austria!
[Updated 3 p.m. ET, Monday, July 18] The sign is a joke. There's no grass at all on Coober Pedy Opal Fields Golf Club in Coober Pedy, Australia.
[Updated 4 p.m. ET, Monday, July 11] This photo is from Arches National Park in eastern Utah.
[Updated 3:30 p.m. ET, Monday, July 4] You're looking at Port Hercules, the glamorous harbor in Monaco where luxury yachts aren't hard to find.
[Updated 4:30 p.m. ET, Monday, June 13] These blue buildings can be found in the tiny village of Juzcar, Spain, which is in the province of Malaga near the country's southern coast.
[Updated 3:30 p.m. ET, Monday, June 6] You're looking at Wastwater, a lake in England that was voted "Britain's Favourite View" by television viewers in 2007.
[Updated 3:30 p.m. ET, Monday, May 30] The "pig" above is running the Gothenburg Half Marathon in Gothenburg, Sweden.
[Updated 3:30 p.m. ET, Monday, May 9] This photo was taken in Valencia, Spain, last month during Semana Santa (Holy Week) celebrations.
[Updated 3:30 p.m. ET, Monday, April 25] The photo above was taken last week at the colorful tulip fields in Lisse, Netherlands.
[Updated 4:15 p.m. ET, Monday, April 18] The photo above was taken last week at the Songkran festival in Thailand's Ayutthaya province. Songkran marks the beginning of the lunar year in Thailand. The ancient religious festival is an opportunity for Thais to relax with family, pay respect to monks and elders, and receive blessings of prosperity for the new year.